Scam, They don't have much information about it and even Teams who manage the project, Tell your sister there are still many good project to invest, which already listed or pending to be listed on some popular exchanges. Guide your sister and teach her different ways on finding good project to invest.
He can educate first himself so that if his sister would ask him any question regarding to crypto currency invest, he can answer it quickly and correctly. In that case, he can easily convince his sister to avoid such scam projects. We should be careful in investing in cryptocurrency, top cryptocurrency sites would be the best option for us to invest. We should also provide a high security wallet for our tokens.
maybe he already got education about cryptocurrency but the one who gave a lesson was not the right person meaning he did give lessons to you about cryptocurrency but in the wrong way ultimately makes your brother trapped and has the risk of losing his assets and certainly it will make you disappointed.